Thanks TCFLyR. That's just what I needed.

Need some help fellas. This past weekend ran my 21-4c, 9853, and unknown long header. Standard d8 clutch with trimmed shoes, sidewinder team strike 30%. For a 7 minute quality came in near empty, 230*. Track is pretty open, long straights and fast sections Any suggestions, maybe another pipe and header combo for better fuel mileage?

The combo that you have i think is a good combo for power but not for mileage

Use a nova 9901 and the 41021 header and use the 6.5 restrictor and don't be afraid of closing the needles and bring it to 245 degrees and you should be fine

Ricardo is pretty spot on

9853ss is not too bad as far as mileage though


remember this , the smaller the restrictor the higher the running temps

Thanks Monty. I think I am going to order an actual Nova header. I am running the 6.5 already. I just feel that I could be getting better mileage than I do. I am gonna compare to my buddy that has near the same setup. What I really wish is that the guy who came up with our track design wasnt so into high speed. I love technical/ very short straight tracks like the nats track this year.

lmk if you need anything

No problem thanks for the help. One other question should I be running p3 or p4 plugs? That is what I have readily available in my pit box.

i dont recommend os plugs . its up to you but p4 would be a better choice for nova engines , p3 is ok but p4 is better


you shoud be running c5tgc or c6tgc or odonnell 97t 99t

Sorry for all the questions. Guess its time to place an order and get this thing sorted the right way lol. Thanks again Monty!

The OS p3 is one of the "worst" plugs i use... shure, it makes almoast any engine run and tune ok, but it do not even get the best perfomance out of OS engines. For many, it is the best plug becasuse it makes the engine easy to tune and run ok.

`My advice, is, get the Nova C6tgc as Houston suggests, and then run and retune you engine. You will find alot of run time, maye as much as a minute and a half.

Monty how about any runtime difference between the nova and odonnell plugs.

the odonnel plugs are like 6-8 times cheaper than the nova ones but I dont want to sacrifice runtime

I have also just got some c7tgc plugs as its hot here in asia 90-105 ambient temp - any comments on that plug, I have been running the c6tgc

definately go the odonnell plugs you are running in the same humidity as me so try the 77t or even the 87t, tower hobbies had them for $3 each on my +4 with a 6.5 restrictor 9901/20 I was getting nearly 11min on 30% at about 230f

I just purchased a +4c and was curious to if the rb 2045 will work with it. I plan on ordering a 2084/41021 combo but don't really have the 100 bucks at the moment. My setup is a rc8t 1.0 springs aluminum hard shoes and I think I will start with the 7mm inserts and odo97t plug. The reason for the switch is b/c a guy that I raced against last week was running a fusion motor he got from Monty with the full service. The guy put 6 tanks thru it bfor he raced it and I swear he pitted around 10:45 and his pit man told him he still had a 1/3 of a tank left. So the ws7 is going on the shelf. Hehe

Why not get a Fusion X7? They are close in price to a Plus 4.

Not for me. The nova was better for me.